The RW of my LMB was always higher after electroshocking/tilapia years. The CNBG fingerlings the next spring were more abundant also. I stocked tilapia once, and told T Overton that my only requirement was that the tilapia couldn't be eaten. He met that, but the number of tilapia was very low because of their size. I don't think they would be enough to damage the CNBG beds.